Excavating machinery



w. M. BAGER ET AL ,81 05 EXQAVATING MACHINERY Aug. 11, 1931.

Original Filed Jan. 4, 1926 (2 2 5 a l ma,

INVENTORS:

A TTORNEYS.

Patented Aug. 11, 1931 I v warren sTArss rArsnr caries;

WILLIAM M. ,BAGEB. AND \VERNER IEHLMAN, OF SGiTTH MILVIAUKEE, WISCONSIN, AS-

SIGNORS TO BUCYRUS-ERIE COMPANY, OF- SOUTH MILWAUKEE, WISCONSIN, A

CORPORATION 01? DELAWARE EXGAVATING MACHINERY Original application filed anuary 4, 1926, Serial No. 79,162. Divided. and. this application filed March 22,

This application is a division of our copending application, Serial No. 79,162, filed January l, 1926.

Our invention relates to new and useful improvements in excavating machinery, particularly of the types known as revolving shovels; and more particularly relates to the method of constructing the revolving frame upon which the working parts are mounted.

Our revolving frame is made of two castings rigidly pin-connected together, the line of division being transverse of the frame. While this frame could be cast in one piece, it would tax shop facilities to machine such a large member. We have thus provided a construction next best to a unitary casting, and much superior to the usual structural frame consisting of two side beams and a number of cross beams, all connected by a multiplicity of bolts which are likely to work loose, thereby causing loss of time for constant overhauling.

One object of our division of the revolving frame into two castings is to supply an interchangeable rear end for this frame. According as the power to actuate the prime mover is steam, gasoline, electric or other power, certain radical changes, besides that of the prime mover itself, becomes necessary. It is obvious, for instance, that a steam boiler, requiring ash pit, bunker space, etc., necessitates a different base than an electric, gasoline or Diesel motor. In order to avoid the change of the whole revolving base, we have placed the power-generating plant and its more immediate accessories upon the rear portion of the frame, keeping the machinery elements which are independent of the character of the source of power on the forward, permanent portion. In some embodiments of our invention, the rear portion may be built so as to carry the various power sources without material change; such items of machinery as require a material change in seat, when changing from one form of power to another, being located on the forward portion, which thus becomes the impermanent changeable portion.

The rear portion is pin-connected to the forward portion. This division of the revolv- Serial thereof, whichare defined in the appended claims; and of which one embodiment is exemplified in the accompanying drawings, which are hereinafter particularly described and explained.

Throughout the description, the same refer- I ence number is applied to the same member or to similar members. I

Figure 1 is a more or less conventionalized side View of an excavator built according to our invention, certain parts that are not essential thereto being omitted.

Figure 2 is an enlarged side view, showing in detail out method of joining the rear cast ing to the forward casting.

Figure .3 is'a sectional view of the joint, the section being taken along the line 3-3of Figure 2. p

Figure 4 is a plan view of the same joint.

It will be seen that 1 represents the main base casting of a turntable, revolvablymounted on casting 2, which is in turn supported on two creeping traction units, one of which is shown conventionally as 3 in Figure 1.

Casting 1 carries the hoist winch 4, the swing machinery 5, the A-frame 6, and the boom 7. The boom is supported from the A-frame by back-braces 8. The raising and lowering of the dipper (not shown) is accomplished by means of the hoist rope 12, which is actuated by the hoist winch 4:.

All the foregoing is common to many types of power shovel, and is therefore only con ventially shown in Figure 1.

Casting 1 carries at each side, at the rear thereof, two upwardly projecting lugs or ears 15a, and two downwardly projecting lugs 155, by means of which is attached and supported the rear-end casting 16, which carries the steam boiler 17 or other prime mover and its appurtenances. Each of the lugs 15a and 157) is provided with an eye 65.

The rear end casting is similarly provided at each side, at the front thereof, with a vertical lug 66, of a -form adapted to enter the space which lies between the two upwardly projecting lugs 15a and which is continuous with the space between the two downwardly projecting lugs 15b. The lug 66 is provided with eyes aligned with the eyes in lugs 15a and 15?), for the reception of bolts 67, by which the rear casting 16 is held in rigid adjustment to the front casting 1. Each :of said eyes in lugs 15a, 15b and 66 is provided with "bosses 68." The various lugs may also be reinforced by flanges, as 69 reinforcing the in ner lug 15a, and 70 reinforcing the lug 66.

Braces 18 connect the A-trame 6 to the rear-end casting, but do not contribute, except incident-ally, to the support of the rearend casting.

It is evident that our invention has provided a structure that is a distinct advance over the prior art. For our base frame is very rigidly connected. It can be more easily constructed, and presents no difliculties of shipping. In case the power unit is changed, such change involves no unnecessary scrapping and may be made in much less time than with former constructions, in that only such parts are removed as must necessarily be removed.

Having now particularly described and illustrated one form of our improved excavating machinery, we wish to be understood as not limiting ourselves to the particular form exemplified, but rather as availing ourselves of all equivalents.

In the claims which follow we shall allude to the front end casting 1 as the turntable proper, the rear-end casting 16 as the eX- tension, and both parts together as the revolving superstructure.

We claim:

1. In a machine of the class described, the combination of: a propelling base; a turntable base proper mounted thereon; and a separable extension base to said turntable base, attached thereto and supported thereby; the means for attachment including two junctures, each of which consists wholly in two vertical plates projecting from one of the parts to be joined, one vertical plate projecting from the other of said parts. and placed between said first mentioned two plates, a horizontal hole through the top of each set of plates, a horizontal hole through the bottom of each set of plates, and pins through each hole for securing the plates to gether.

r: lilnia ma h ne f the class described: a.

propelling base; a turntable proper mounted thereon; and a separable extension to said .atures.

WILLIAM M. BAGER. lVERNER LEHMAN. 

